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Q.

Helium is used in gas balloons instead of hydrogen, because

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a

It is monoatomic

b

It is lighter

c

It is not radioactive

d

It is non-combustible

answer is D.

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Detailed Solution

Hydrogen is lighter than air but it is also flammable i.e it can burn, as oxygen is also present in the air, so there is a high risk of explosion and fire is there. So to solve that problem Helium which is lighter than air and is non-combustible is added instead of hydrogen so as to fill balloons.

Hence option D is the correct answer.

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